如何使用 boost::filesystem 库获取文件大小

要使用 boost::filesystem 库获取任何文件（在我们的示例中为 test.xml）的文件大小（以字节为单位），使用此代码片段：

filesize-example.cpp

#include <experimental/filesystem>
#include <iostream>

using namespace std;
using namespace std::experimental::filesystem;

int main() {
    size_t filesize = file_size("test.xml");
    cout << filesize << endl;
}

#include <experimental/filesystem>
#include <iostream>

using namespace std;
using namespace std::experimental::filesystem;

int main() {
    size_t filesize = file_size("test.xml");
    cout << filesize << endl;
}

你需要链接 boost_filesystem 和 boost_system 库，即像这样编译：

build-filesize.sh

g++ -o test test.cpp -lboost_filesystem -lboost_system

g++ -o test test.cpp -lboost_filesystem -lboost_system

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